This is a rare meteorological phenomenon called a ‘SKY PUNCH’. When people see these,they think it’s the end of the world. Ice crystals form above the high-altitude cirro-cumulo-stratus clouds,then fall downward, punching a hole in the cloudcover.
Severe Skies: The Photography of Storm Chaser Mike Hollingshead
Hooked-up With A Thunderstorm.One of the two types of arcus clouds, shelf clouds are often associated with thunderstorms. They are low, horizontal and wedge-shaped and are attached to a parent cloud, usually a thunderstorm.
See the Eruption of Chile's Calbuco Volcano Paint the Sky
Super-cell Lightning, Snyder, Nebraska Under a super-cell thunderstorm, a "wall cloud" or "pedestal cloud" may form. This is frequently associated with tornadoes and micro-bursts. Here, a "cloud-to-ground" lightning bolt strikes from a wall cloud.
Amazing supercell storm as twilight nears a York Nebraska truck stop on as it spits out lightning, June Only a half hour or so earlier this storm was producing a long-lived large tornado near Aurora Nebraska.
'They passed away doing what they loved': Three storm chasers including father and son killed by Oklahoma tornado as 12 confirmed dead